Device for muffling sounds.



A. DARE. DEVICE FOR MUFFLING SOUNDS. APPLICATION FILED MAR. 15, 1912.

Patented D80. 16, 1913.

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COLUMBIA PLANOGRAPH co., WASHINGTON. D c.

UNITED STATES PATENT oEEIcE.

ARTHUR DARE, OE BHILADELIPHIA, PENNSYLVANIA.

DEVICE FOR MUFFLING SOUNDS.

To all whom it may concern:

Be it known that I, ARTHUR DARE, a citi zen of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Devices for Mufiling Sounds, of which the following is a specification.

My invention relates to improvements in devices for reducing or mufiling sound, particularly such sounds as may be caused by the human voice, and the primary object of my invention, therefore, is to render sound produced by the human voice indistinct or incoherent outside of the transmitter of a telephone or other instrument into which sound waves may be directed or be developed. Thus, for instance, in telephone service, two persons may be sitting in proximity to each other and one may talk into the transmitter of the telephone instrument without the other being able to under stand what is being said, while, at the same time, the spoken message will be clearly and distinctly transmitted to a person in line of communication with the instrument.

hIy present invention embodies improvements in addition to those described and claimed in Letters Patent granted to me December 22nd, 1908, No. 907,320.

The various features of novelty which characterize my invention are pointed out with particularity in the claims connected to and forming a part of the specification, for a better understanding of which, however, and the advantages possessed by it, reference may be had to the accompanying drawings and descriptive matter, in which I have illustrated and described one of the forms in which my invention may be embodied.

Of the drawings :-Figure 1 illustrates an elevation of a telephone transmitter constructed and arranged according to my invention. Fig. 2 represents a side elevation of the same. Fig. 3 is an enlarged front elevation of the mouth-piece. Fig. l is a vertical section of the mouth-piece, the section being taken on line M of Fig. 3, and Fig. 5 represents a transverse section on line 5-5 of Fig. 4.

The mouth piece comprises a cylindrical casing A, provided with a detachable cover A to which is threaded a flaring extension A fashioned to cover the lips and a portion of the face of the operator. The casing A is also provided with a diaphragm B, which Specification of Letters Patent.

Application filed March 15, 1912.

Patented Dec. 16,1913.

Serial No. 684,059.

covers a sound discharge passage A said diaphragm being secured to the casing by suitable springs B held in place by binding screws B Sound waves, together with exialed air admitted to the flaring extension A pass through a series of openings (4 a etc., in the detachable cover A and the exhaled air produced in talking is permitted to escape through an exhaustpassage A In order to render sound produced in any manner, but particularly sound produced by the human voice, indistinct or incoherent as it is carried by exhaled air through the exhaust passage A I provide said exhaust passage with an exhaust head or mufiier C, as more clearly illustrated in Fig. 4. The exhaust head 0 comprises a tube threaded to the casing at a point C and having bifurcated discharge passages c and c terminating in oppositely disposed openings 0 and 0 between which is a slit or narrow air-gap for the discharge of air.

The device thus described may be attached directly to the transmitter of a telephone of ordinary construction by means of suitable connections. I prefer, however, to employ connections such for example as those illustrated in Figs. 1 and 2 of the drawings which I will now proceed to describe. The casing A, is provided with a threaded nipple a to receive a correspondingly threaded coupling D, fitted also to receive one or more non-resonant tubes D and D.

In ordinary practice I prefer to employ two tubes as shown in Fig. 2, which tubes are preferably made of india-rubbcr of any convenient caliber and length. The tubes D and D are in turn connected to terminals D and D comprising tubes having slightly flared ends as shown by dotted lines in Fig. 2, and these tubes are fastened to a ring D detachably secured to a transmitter D, which represents the mouth piece of a telephone of ordinary construction.

In some instances the diaphragm B may be dispensed with, permitting a clear passage between the casing A and the transmitter D, or the casing A, together with its extension A and the exhaust-head C may, if desired, be connected direct to a telephone instrument in lieu of the transmitter D*. I prefer, however, for telephone service, to employ the construction shown in its entirety, particularly the diaphragm B, which serves as a means to further mufile 2. A sound transmitting device comprising a casing provided With a mouth piece and a sound discharge passage, an exhaust-head mounted upon the casing and provided with oppositely disposed discharge orifices, and one or more non-resonant tubes leading from the casing to the mouth piece or horn of a telephone instrument, substantially as described.

In testimony whereof I hereto afiix my signature in presence of two Witnesses.

ARTHUR DAR-E.

Y Vitnesses JAY R. GRIER, JOHN J. CLARKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

